Kokentoe
Member
- Joined
- Mar 30, 2012
- Messages
- 39
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- Location
- Sydney
- Members Ride
- 2005 Holden VZ Storm Ute
Hey guys, I've got a VZ V6 which has 230,000km on the clock. It was running great until recently with what can be described as a delay in acceleration response. Basically when you accelerate it takes longer than normal to get up to speed and it feels inconsistent, so the car starts building up speed slowly then around 70km it tends to jerk you forward.
The car starts up normal, idles normal and does not shake or make popping noises from the exhaust, so it's not misfiring. Spark plugs are fine, coil packs are fine, no apparent vacuum leaks, no check engine light, always filled up with 98. Tried running some of that injector cleaner through but no real changes. Scan tool hooked up and showed no error codes. MAF sensor was cleaned with the specific cleaner. Oil was changed recently. Car has cold air intake which is clean, mace manifold insulators, hi flow cats, cat back exhaust, and custom tune.
Car does not stall and does not feel like it's not getting sufficient fuel making me think it's not fuel related. I'm leaning towards the transmission, which is the 4 speed auto. Fluid levels seem normal though. Is lack of power and delayed response a symptom of a failing transmission? Sometimes the rpms hold before gear changes, and after letting off the throttle. Or could it also be the throttle body causing the problems? The throttle body itself is perfectly clean, but I've heard the sensor can go, then again would that normally throw a check engine light?
I'm hoping it's not the engine itself wearing out, cause not long ago the car was running better than ever and then one day it suddenly started playing up and now feels terrible. Apart from transmission and the TPS, does anyone else have other suggestions as to what could be the problem? Timing chain, etc? Any help is appreciated, cheers.
The car starts up normal, idles normal and does not shake or make popping noises from the exhaust, so it's not misfiring. Spark plugs are fine, coil packs are fine, no apparent vacuum leaks, no check engine light, always filled up with 98. Tried running some of that injector cleaner through but no real changes. Scan tool hooked up and showed no error codes. MAF sensor was cleaned with the specific cleaner. Oil was changed recently. Car has cold air intake which is clean, mace manifold insulators, hi flow cats, cat back exhaust, and custom tune.
Car does not stall and does not feel like it's not getting sufficient fuel making me think it's not fuel related. I'm leaning towards the transmission, which is the 4 speed auto. Fluid levels seem normal though. Is lack of power and delayed response a symptom of a failing transmission? Sometimes the rpms hold before gear changes, and after letting off the throttle. Or could it also be the throttle body causing the problems? The throttle body itself is perfectly clean, but I've heard the sensor can go, then again would that normally throw a check engine light?
I'm hoping it's not the engine itself wearing out, cause not long ago the car was running better than ever and then one day it suddenly started playing up and now feels terrible. Apart from transmission and the TPS, does anyone else have other suggestions as to what could be the problem? Timing chain, etc? Any help is appreciated, cheers.